remove redundant code

include/armadillo_bits/op_vectorise_meat.hpp

@@ -114,15 +114,9 @@ op_vectorise_col::apply_direct(Mat_noalias<typename T1::elem_type>& actual_out,
   
   Mat<eT>& out = actual_out;
   
-  if(is_Mat<T1>::value)
-    {
-    const plain_unwrap<T1> U(expr);
-    
-    out.set_size(U.M.n_elem, 1);
-    
-    arrayops::copy(out.memptr(), U.M.memptr(), U.M.n_elem);
-    }
-  else
+  // no special handling for T1 = Mat, as that currently can't happen;
+  // the Mat class uses the Mat_noalias type only for delayed expressions
+  
   if(is_subview<T1>::value)
     {
     const subview<eT>& sv = reinterpret_cast< const subview<eT>& >(expr);